"John Rumm" wrote in message
o.uk...
jim wrote:
On 30 Aug, 11:00, jim wrote:
On 30 Aug, 10:55, "ARWadsworth"
wrote:



"Harry Bloomfield" wrote in message
k...
ARWadsworth wrote :
Queries
13A fuses for 16A immersions?
45A DP switches - wouldn’t 20A DP do and be a bit cheaper?
The 13amp fuses might well last for months, but none the less they are
not
appropriate, nor is the spur unit rated at 16amp.
Two separate circuits from the DB would be a better way to it, each
rated
at 16 or 20amp. Failing that, a 2way DB mounted at the far end of the
32amp feed, with a 20amp rated DP switch for control.
--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk
The OP will have to have a look and see what the "one circuit" that
feeds
the heaters consists of. I do like the idea of a 2 way CU at the far
end of
the circuit if it is a 4mm or 6mm supply.
Adam
yep I'll have a look later on and come back with full spec.
cheers
JimK

ok had a look now and there is

both wired to 1way in the CU (tho outside of the RCDs so presumably
it's a 32A RCBO? - has a yellow test button)
from CU in 2 runs of 4.0mm T+E to the 45A DP switches,
from 45A switches in 2 runs of 4.0mm T+E to the 13A switched fused
spurs next to the heatbank
from the 13 A spurs in heat resistant 3 core flex to each immersion

yes the immersions are 3kw each (the install notes required 16A
supplies for each which was where I got the 16A idea from...)

In which case that all seems to be in order then ;-)

--
Cheers,

John.


It is just an odd setup. I cannot find anything dangerous about the setup it
just seems odd or just overkill. The sparks may not have had the specs about
the heaters. He certainly did not lay 4mm T&E for fun.

The standard circuit would be two seperate 16A MCBs using 2.5 T&E and 20A
double pole switches in all rooms.

As John says, "it is in order"

Adam